S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Materials Science and Engineering (재료공학부) Journal Papers (저널논문_재료공학부)
High-Efficiency Solution-Processed Inorganic Metal Halide Perovskite Light-Emitting Diodes
- Issue Date
- Advanced Materials, Vol.29 No.31, p. 1700579
- cesium lead halides ; electron-phonon coupling ; inorganic halide perovskites ; light-emitting diodes ; next-generation emitters
- This paper reports highly bright and efficient CsPbBr3 perovskite light-emitting diodes (PeLEDs) fabricated by simple one-step spin-coating of uniform CsPbBr3 polycrystalline layers on a self-organized buffer hole injection layer and stoichiometry-controlled CsPbBr3 precursor solutions with an optimized concentration. The PeLEDs have maximum current efficiency of 5.39 cd A(-1) and maximum luminance of 13752 cd m(-2). This paper also investigates the origin of current hysteresis, which can be ascribed to migration of Br-anions. Temperature dependence of the electroluminescence (EL) spectrum is measured and the origins of decreased spectrum area, spectral blue-shift, and linewidth broadening are analyzed systematically with the activation energies, and are related with Br-anion migration, thermal dissociation of excitons, thermal expansion, and electron-phonon interaction. This work provides simple ways to improve the efficiency and brightness of all-inorganic polycrystalline PeLEDs and improves understanding of temperature-dependent ion migration and EL properties in inorganic PeLEDs.
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